NC.1.OA.8

In this standard, students apply addition and subtraction strategies to solve equations with an unknown whole number. In first grade, the unknown symbols are boxes or pictures. Students are expected to explain orally and begin to informally explain in writing their process of finding the unknown in an equation. 

Based on the specific problem types in NC.1.OA.1 the unknown whole number cannot be the starting number of an equation, and all problems are one-step problems. Students should begin exploring this standard by using concrete models (manipulatives) and drawings to support their work before using more of the strategies specifically expected in first grade. The table provides specifics about the relationship between NC.1.OA.1, NC.1.OA.6, and NC.1.OA.8. Teachers should consider how multiple opportunities for students to solve word problems addresses multiple standards at one time.